Tread band for pneumatic tires



G. H. ALLDEN.

TBEAD BAND FoR PNEuMATlc TIRES.

APPLICATION HLED MAY14, 192|. 1,425,356.

narran GEORGE HENRY ALLDEN, 0F FOLKESTONE, ENGl'Ialil'D.`

TREAD BAIN D FOR PNEUMATIC TIRES.

Specification of Letters Patent.

Iatented Aug. 8, 19322.l

Application led May 14, 1921. Serial No. 469,470.

To aU whoml may concern.'

Be it known that I, GEORGE Hangar ALL- DEN, M. B., M. S., a subject of the ing of Great Britain, residing at Folkestone, Kent, England, have invented new and useful Improvements in or Relating to Tread Bands for Pneumatic Tires, of which the following is a specification. y

This invention relates to tread bands for pneumatic tires.

My invention is of the kind wherein there are provided inter-engaging V-shaped projections and'depressions on the tread band and tire cover, the arms of the Vs being in some cases unjoined and being formed at their ends with lateral perpendicular interengaging surfaces to enable the 'tread band to resist lateral stresses. y

According to my invention, the V-shaped projections are arranged in combination with circumferential substantially perpendicular surfaces arranged at the sides of the tread band, such surfaces facing each other and engaging corresponding lateral circumferential surfaces on the tire'cover. Moreover a reinforcing band of non-elastic material is incorporated with the tread band adjacent to the V-shaped projections. By this means, a very effective resistance is offered to lateral displacement of the tread band in addition to oering resistance to motion of the tread band circumferentially on the cover. Y

In the accompanying drawing, I have shown how my said 4invention may be conveniently and advantageously carried into practice. In this drawing Figure 1 is a planand Figure 2 is a transverse section of atread band constructed as one example according to my invention. y

Figure 3 is a similar section illustrating a modification.

Referring first to Figures 1 and 2, the tread band is made in any suitable known A manner 'of vulcanized india rubber A, with lateral lips B, B which are made sufliciently elastic to permit of the band being levered into position on the tread of the tire when the latter is deflated. In the body of the tread there is vulcanized a reinforcing band C formed of a number of plies of strong canvas. The periphery or tread surface D of the tread band is provided with a series of V-shaped depressions E, E, for forming a non-skid surface.

On the inner side of the tread band there is formed a series of V-shaped projections F, F, which are arranged in pairs symmet-v rically about. the centre line of the band with the angles facing each other as'shown in Figure 1. These projections are preferably arranged oppositely to the' depressions E, E

of corresponding form on the outside of the band lying immediately above them, as in dicated in full and dotted lines in Figure 1. The edges of the projections F, F are preferably rounded, as shown in Figure 2, so as to facilitate their entrance into the depressions G, G` of corresponding shape in the treadsurface of the tire cover H.

In order to enable it to be determined when the projections F,.F and depressions lG, G are in register with each other,- marks varmour M for engaging with the road surface.

The tread of the tread-bandeau moreover be provided with steel studs or other armour secured, e. g. to-a shield such as L, or. ar-

ranged in any other suitable manner. The

rubber of the tread band may also be reinforced by materials such as cotton, cord, fibre, linen, asbestos, iron filings, or the like. It may be moulded'to any desired pattern externally; and the interior surface can be made with ,projections or depressions to correspond with the depressions or projections on the outer surfaces of existing tire-covers, provided that such surfaces afford suicient abutment for resisting lateral and circumferential slip bf the tread band relatively to the tire cover, when the tire is inflated.

I claim 1. The combination in a pneumatic tire, of a cover and a tread band, said cover and tread band having interengaging projections and depressions, which are of V- shape and are separate from each other and comprise lateral surfaces lg'ing in planes perpendicular to the axis o the tire, a relnforcing band of non-elastic material 1nv corporated circumferentially in the tread band, the treadband having continuous lateral circumferential surfaces, which face inwardly and lie in planes substantially perpendicular to the axis Aof the tire, and the cover having 4continuous circumferentia'l surfaces corresponding to and engaging with the circumferential surfaces on the tread band. t

2. The combination, in a pneumatic tire, of a cover and a tread band, said cover and tread band having interengaging projections and depressions which are. separate from each other and are of V-shape with the open ends of the Vs facing alternately in opposite directions along the circumference of the tire, such proJections and deressions also comprising lateral surfaces -ing in planes erpendicular to the axis of tiie tire, a rein orcing band of non-elastic material incorporated circumferentially in the tread band, the tread band having continuous lateral circumferential surfaces facing, inwardly and lying in planes substantially perpendicular to the axis of the tire,

ineumatic tire,

havlng lnteria reinforcing band of non-elastic material incorporated circumferentially in the tread band, the tread band having continuous lateral circumferential surfaces facing inwardly and lying in planes substantially perpendicular to the axis of the tire, and the cover having continuous circumferential surfaces corresponding to and engaging with the circumferential surfaces on the vtread band, said tread band and tire cover being' provided, respectively, with marks reglstering with each other when the interengagingprojections and depressions are in with each other.

GEORGE HENRY ALLDEN. Witnesses:

Gncaen HAmusoN,

'JOHN T. KN'owLns.

register 

